SB2026091222 - Race condition in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89752)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the memory.high and memory.max limit update handlers when concurrently updating memory cgroup limits through separate open files. A local user can lower a memory.max limit and restore it through another open file to cause a denial of service.

Exploitation requires a cgroup populated with anonymous memory and swapping disabled.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/39ec1e4183a718f448b2e9de681dcbdda18fce42
• https://git.kernel.org/stable/c/9477820c63cbf4d97114238f3d1ff10dfd6bee3f
• https://git.kernel.org/stable/c/95d87030cae7764805aa7c621c52871139297cb0
• https://git.kernel.org/stable/c/aab391074de96ed601eeca32daef9a8507d436d9